* Upgrade Node.js to v22 LTS across the entire repo
- Update CI workflows (.github/workflows/ci.yml, code-size.yml) to use Node.js 22.x
- Update Netlify config to use Node.js 22.11.0
- Update all package.json engines to require Node.js 22.0.0+
- Add .nvmrc file with Node.js 22 for local development
- Update documentation to reflect Node.js 22+ requirement
- Update skin-database scripts to use Node.js 22
- Tested locally with nvm and confirmed builds work correctly
Node.js v22 is the current LTS version and provides improved performance
and security features. All packages now require Node.js 22+ to ensure
consistency across development, CI, and production environments.
* Don't update node version here
